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Патент USA US3064850

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Nov. 20, 1962
B. E. u_oN
3,054,840
LOAD HANDLING DEVICE
Filed April 4, 1961
5 Sheets-Sheet l
m
0t0 ;
mm
INVENTOR.
-BENGT E. ILON
Nov. 20, 1962
B. E. lLoN
3,064,840
LOAD HANDLING DEVICE
Filed April 4, 1961
5 Shee'cS-Sheei'I 2
FIG.3
INVEN TOR.
BENGT E. I LON
"WÁJÉQM
WML?
Nov. 20, 1962
B. E. n_oN
3,064,840
LOAD HANDLING DEVICE
Filed April 4, 1961
5 Sheets-Sheet 4
INVENTOR.
BENGT E. ILON
“MÉMQ
mi#
NOV» 20,
B_ E° ‘LON
LOAD HANDLING DEVICE
Filed April 4, 1961
5 Sheets-Sheet 5
INVENTOR.
BENGT E. lLON
"MÉJWQ
United States Patent G Mice
Patented Nov. 20, 1962
2
1
In order to provide proper engagement of the load, a
fifth member 28 is provided and this member is mounted
to form with the top 21 of the quadrangle a rigid exten
sion that terminates on an opposite side of the quadrangle
from the base extension 25. For ease of operation, the
rearwardly extending boom 28 is pivotally mounted to
the top of the quadrangle by means of a suitable bracket
29 and pivot 30.
An adjustable stop or block 31 is provided to engage
the quadrangle top 21 at a point intermediate the points
of juncture with the respective sides. This enables ac
commodation of a wider variety of loads by controllably
limiting the pivotal movement required to bring the rear
3,064,840
lion, Framnasbacken 6, Solna, Sweden
LOAD HANDLING DEVICE
Bengt
3,064,840
Filed Apr. 4, 1961, Ser. No. 100,710
7 Claims. (Cl. 214-350)
This invention relates generally to hauling units
adapted to lift and tow loads engaged thereby.
A- typical example of the use of such unit is in the
logging industry where logs are towed from the woods to
more’convenient locations for further handling.
It_1s a primary object of the invention to provide a
hauling unit of the type described in which a great por
tion of the ultimate load is applied as a downward force
extension into rigid engagement with the quadrangle top
on the prime mover rather than being transmitted pri 15 21.
offsetting of the bracket 29 and pivot point 30 by
manly as a lateral force.
It is a further object to provide a trailing unit adapt
which the rearward extension 27 is mounted to the
able to lift the front of the load being hauled automati
quadrangle provid-es the advantages of a greater reach
cally upon forward motion of the prime mover and with
and greater lift upon operation of the device, all as will
out the application of any forces other than those gen~ 20 become more apparent as this specification proceeds.
erated by forward movement of the prime mover.
When a load is on the device, as shown in FIGS. 1 and
The foregoing and other objects will become more
3, a substantial portion of the pulling force is converted
apparent from the following description which is to be
to a lifting component and the resulting downward re
taken in conjunction with the accompanying drawings,
action component acts directly on the tractor at the pivot
the description being o‘lfered by way of illustration only 25 26 to thereby increase traction with the ground thereby
and not in limitation of the invention the scope of which
increasing efficiency.
is defined by the appended claims rather than by any
fold: First, because a significant portion of the load is
lifted free from the ground, the required force to pull
the load is greatly reduced. Second, the increased trac-v
preceding description.
In the drawings:
The advantages are at least two
FIG. 1 is a side elevational view of an embodiment of 30 tion makes pulling more eñicient. Moreover, the overall
the invention mounted on a log loading device.
effect is a reduced power demand for any given load be-v
FIG. 2 is a top partial plan view of the embodiment
of FIG. 1.
cause in addition to elimination of normal friction, the
danger of plowing by the front of the load is completely
.
FIG. 3 is a side elevational view of another embodi
ment of the invention.
,
FIG. 4 is an enlarged side elevational view of the
embodiment illustrated in FIGS. l and 3.
FIG. 5 is a top elevational of the unit of FIG. 4 taken
avoided.
35
_«
The only downward force applied to the tractor is at
the pivot point 26 by which the unit is attached thereto.
This is extremely important because it provides a down
force at any selected point and thereby enables optimum
generally in the plane of lines 5_5 of FIG. 4.
distribution of the traction force. Additionally leverage
FIG. 6 is a view taken generally in the plane of line 40 action normally encountered when lifting a load on a
rearwardly extending support is eliminated.
6-6 of FIG. 4.
FIG. 7 is a view taken in the plane of line 7-7 of
For purposes of storing the unit out of contact with
the ground when it is inoperative, there may be provided
FIG. 5.
FIG. 8 is a view taken as looking in the direction of
arrows 8 in FIG. 4.
_
FIGS. 9 and lO are diagrammatic Views illustrating
operation of the .device when starting from a position in
a boom 32 (FIG. l) which isV moved up and down by a
suitable unit such as hydraulic. cylinder 33. y The boom
is provided with a chain or other hook for connectionto
a bracket 34 on the boom 28.
The load to be hauled is engaged at two points. The
FIGS. l1, l2 and 13 are diagrammatic views, similar
first point is at the rear terminal end of the boom 28
to those of FIGS. 9 and- 10, but illustrating motion of
which isjprovided with teeth 36 for- gripping the top of
the device when starting from a different position.
50 the load. The second engagement point is at the loca->
Referring now to FIGS. l through 8, like reference
tion selected toeifect lifting of the load and which is
numerals will be utilized to describe similar elements.
accomplished by means of a chain such as 37 (FIGS.
In such drawings, the hauling unit is illustrated as
1-2) or tongs 38 (FIGS. 3-7).
rest on the ground.
attached on a track-type tractor 19 which is commonly
used in logging operations.
Basically the unit comprises a collapsible quadrangle
formed from four structural members including a base
20, a top 21 and spaced apart side members 22 and 23.
The quadrangle thus formed is completely collapsible by
virtue of all members being pivotally joined together at
their points of connection 24.
The base member is provided with a rigid extension
25 which is pivotally connected tothe prime mover as
at a point 26 spaced from the quadrangle itself. This
In FIG. 3 it will be noted that the unit is mounted to
a regular draw bar on the tractor. This puts the down
force close to the wheel axles and can be modified so
that the down force or pivot point is directly over the
axle.
In FIGS. l and 2 there is illustrated an embodiment
60 where the rigid unit is connected to a U frame 39 that is
in turn connected to the tractor at pivot points 26 located
between the front and rear axles.
Reference is now made to FIGS. 9 and l0 illustrating
operation starting from a position of rest on the ground.
permits up and down movement of the base member and 65
In FIG. 9 the unit is shown partially collapsed and
the entire quadrangle with respect to the prime mover 19.
downwardly pivoted to rest on the ground. At this
In connection with vertical movement of the unit, it
point Athe unit is brought into contact with a load by
will be noted that the entire quadrangle moves in a sub
means of the rear hooks 36 of 'boom 2S engaging the
stantially vertical plane and that all its elements are
top of the load, the chain 37 embracing the load to lift
moveable in the same general plane. Horizontal move 70 a forward portion from beneath. As the .tractor moves
ment of the entire unit with respect to the tractor may
be provided for by a suitable pivot Z7.
forward, as .indicated by the change in position of pivot
3,064,840y
3
26 from FIG. 9 to 10, the base 2i) exerts a pulling move-Y
lower point or, by a suita-ble structure, the rear of the`-
ment but, because the load resists forward motion, the
effect is to pull or swing legs 22 and 23 toward the up
boom lcould rest on the ground on skids or the like where-V
by the boom and chain would be used for lifting. Int
other words, the important functions to lbe performed are:
pressionfandtends tol raise the upper member21 and
those of limiting both downward and forward moveboom 28. This imparts a lifting force on chain 37 to
ment of the boom so the lifting cançbe effected upon',
raise lthe front end of the load. The lifting will con
forward movement of the tractor.
tinue until the forward pull of the tractor exerted through
In the structure illustrated in FIGS., 2-8, the pivoti
the base 20 and leg l»23 exceeds the frictional resistance
26 is mounted aft of the rear axle of the tractor. Thisvr
ofthe load.
10 arrangement would normally act to raise the front of
FIGS. 11-13 illustrate further the mechanics involved.
the tractor by lever action. However, this tendency-CarrV
In FIG. l1 the base 20 and its rigid extension 25 are
be overcome and, indeed, reversed by the use of astop
shown »as being substantially parallel to the ground »and
member 40 (FIG. 4)v limiting upward pivoting of the»`
to the top 21 and its extension 28. The load engaging
bottom 20 whereby such upward movement results in`
hook 36 is in position on top of a load to be lifted and 15 a lever action tending to raise the rear and depress the:
the chain 37 is placedraround the load. As the tractor
front of the tractor.
Y
moves forward, indicated by change of position of pivot
Although the 'tongs 38 are illustrated as iixedly'
point 26, the base 20 and side 23 are again placed under
mounted to the boom, they m-ay be pivotally mountedy
tension, but the pulling movement imparted thereby places
for fore and aft swinging movement in a manner similar'
the other side member 22 under compression to thereby 20 to the chain 37;
Y
lift the top 21 and the boom extension 28 with the re
Further in connection with the boom, it will be notedï
sult that chain 37 lifts the -load upwardly. Again, de
that in the embodiment illustrated in FIGS. 1_8, a conpending on the 'frictional resistance’ of they load to> fori
figuration is employed whereby the boom bends down»
ward motion, lifting increases, as indicated -in FIG. 13,
wardly. This is of advantage in that it enables contact
until therev is' a -straight line between thek »base 20 and 25 with the load sooner thanl if: a straight boom ywere em-A
side 123; In practice, this extreme' position would pro ployed, thus requireslless travel about the pivot.
ably never be reached since the friction ‘between’the load
I claim:
o
l
_
»and the ground vwould have been previously overcome
y l'. A hauling unit for use_in a trailing position behindv
right position. This swinging places rod 22 under com-
and the loadwould be trailed along.
a prime mover, said unit comprising a quadrangle
y In' the illustrated embodiment, the collapsibley quad; 30 formed from elongatedv top and bottom members joined'>
rangle isshown in the form of a structurevin which the
-by spaced-apart sides pivotally connected thereto to
'base is shorter than the top yet the sides are substan#
enable’collapsing movement of said quadrangle in a sub-
tially equal in length. This -is not absolutely required
and it would be possible to use a variety of shapes in
cluding a parallelogram. However the structure shown 35
possesses the .advantage of a rapid initial rise and also
a relatively long lever arm action by means of the’longer
to'p member 241 which in effect pivots about the junc
ture between it' and the rear side member 23.
stantially lvertical plane, -a forward extension on' saidÍ
bottom member formed to be rigid therewith and .ter-`
minatin'g outside said quadrangle, means adjacent theterminal end of said forward extension en-abling its piv-otal 'connection to a prime mover for free vertical move-
ment of said extension and quadrangle with respect tö
tlie prime mover;` and> load ylifting means associated with~
o It is important that the pivo-t point where the unit is 40 said quadrangle, comprising a rearward extension of said
mounted to the tractor «be offset, as bythe length of
top member having a terminal end outside of said quadthe extension 2S, from the corner pivot of the vquadrangle
rangle adapted to bear downwardly with respect to a
itself. Without this, lifting due to compression of leg
load to «be lifted, and load gripping means on said rear22 could notoccur after the quadrangle ha‘d> reached a
ward extension at a location forward of its said terminal
point lwhere the -side closest the tractor is substantially 45 end.
'
vertical.
o
Y
2. A _construction according to preceding claim 1 in'
‘As noted, lifting of the load is effected by compression
whieh the Vforward portion of said rear-wardV extension'
of fr_ont side 22 which exerts an upward force on the
of said top member overlaps said top member and is"
forward end of Áthe top 21. Since the rear'terminus of
pivotally mounted for rocking movement with respect>
boom 28 ,resistsv downward movement, it' follows that 50 thereto said pivotal mounting being at a location for'the' further forward the load lifting support (chain 37)
Ward. of said load gripping means of said rearward ex»
isfpla'ced,VV the vgreater will- be the distance of vertical lift
per unit of forward travel. Thus, within practical lim#
tensiof.
~
'
l
3. A construction according -to preceding claim Vl inv
its, the requirement for positioning of the actual load
which said forward extension of said bottom member
engaging. lifters _( chain 3-7 or tongs' 38) is` only that it be 55 includes a U frame the free end_s of which collectively
forward of the fixed 4rear pivot of they boom (teeth 36).
form said terminal end of said forward extension.
Also, `greater lift per unit` of forward travel will occur
4. A construction according to preceding claim l with
as the Ypoint of rigid Contact between the boom land the
the addition of means adjacent said terminal end of said
quadrangle'n moves forward; and it is within the Vscope
forward extension enabling horizontal movement of said
of the invention to provide a forward extension on the 60 extension and quadrangle independently of said means
top 21 so that such contact will be forward ‘of the
enabling vertical movement with respect to a prime mover.
quadrangle.V
Y
_
'
Y _ Qbviously, the quadrangle may be made up as a three
dimensional structure comprising two quadrangles spaced
_5. A hauling and trail assembly comprising a prime
mover„ra rearwardly extending first elongated member
pivotally mounted adjacent one end to said prime mover
This would give added 65 for at least vertical movement with respect thereto, sec
strength. Also, if such a structure were made without
ond. and third elongated members pivotally mounted ad
apart but in parallel planes.
lower cross connectors, it could actually straddle a load
jacent their lower ends .to said base member at spaced
i-f desired and the load lifting could .be done by the top
lpoints thereon for swinging movement toward and away
of the quadrangle.
from said prime mover in a substantially vertical plane,
_It should be noted that the gripping teeth 36, while 70 a fourth elongated member, means pivotally connecting
not, per se, an essential part of the invention, do per
form a desirable function in holding the boom 28 against
forward movement while the lifting function is per
formed. `Qbviously other arrangements can be employed.
the upper ends of Said second and third members to
spaced apart points on said fourth mem-ber whereby
said ñrst, second, third and fourth members form a col
lapsible quadrangle with said first and »fourth members
Also, the boom could be made to engage the load at a 75 forming respectively the top and bottom and the second
5
5
and third members the sides of said quadrangle, a fifth
elongated member pivotally mounted intermediate its
6. A construction according to preceding claim 1 lin
which the length of said top member of said quadrangle
lis greater than the length or said bottom member thereof.
7. A construction according to claim 1 in which .the
ends on said fourth member for rocking movement in
a plane common to that in which said quadrangle col
lapses, said fifth member terminating at one end on the 5 rear portion of said rearward extension of said top mem
opposite side of said quadrangle from said prime mover
ber bends downwardly toward said bottom member.
and extending in the opposite direction at least to an
intermediate location between the pivotal connections of
said second and third members to said fourth member
whereby said fifth member is pivotable into and out of
References Cited in the ñle of this patent
UNITED STATES PATENTS
Contact with said fourth member at said intermediate
location, adjustable block means operable between said
1,861,556
Smith et al. __________ __ .Tune 7, 1932
fourth and iifth mem-‘bers at said intermediate location,
and load carrying means on said iifth member between
its said one end terminus and its point of pivotal connec- 15
tion to said fourth member.
1,870,906
Gottschalk et a1. ______ __ Aug. 9, 1932
2,394,217
Tom ________________ __ Feb. 5, 1946
2,703,180
Brown ______________ __ Mar. 1, 1955
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